TM 5-3820-241-34
(2) Discard and replace all O-rings and seals.
22
Hex head capscrew
b. Inspection and Repair.
1 Roll pin
23
Lockwasher
2 Drill valve handle
End plate
24
(1) Inspect the machined surfaces on the
3 Roll pin
Feed valve
25
valves and the inside of the valve bodies for nicks,
4 Blow valve handle
26
Hex head capscrew
s c r a t c h e s or excessive wear. Remove light
5 Spring pin
27
Valve cap
scratches with a fine polishing cloth.
6 Rotation valve handle
Stem seal
28
7 Valve detent
Clevis seal
(2) Inspect the manifold mating surfaces for
29
8 Roll pin
Driver
30
scratches or excessive wear. Inspect the manifold
9 Feed valve handle
Body seal
31
ports to make sure they are open.
10 Valve detent
Disc
32
(3) Inspect all hardware and threaded areas
11 Hex head capscrew
33
Hex head capscrew
for crossed threads. Retap threaded holes or
12 Lockwasher
Lockwasher
34
13 Drill section cap
35
Feed valve body
replace part. Replace all defective hardware.
14 Stem seal
36
Rotation valve body
5-16. Drill and Feed Control Valve Manifold and
15 Seal clevis
37
Hex head capscrew
Installation
16 End plate pin
Lockwasher
38
17 Hex head capscrew
Manifold
39
a. Reassembly. Reassemble the drill and feed
18 Lockwasher
Driver
40
control valve in the reverse of numerical sequence
19 End plate
Body seal
41
20 Rotation valve
42
Disc
21 End plate pin
Valve body
43
b. Installation.
(1) Refer to TM 5-3805-253-12 and install the
5-15. Drill and Feed Control Valve Cleaning,
drill and feed control valve.
Inspection and Repair
(2) Refer to LO 5-3805-253-12 and service
a. Cleaning.
the rock drill.
(1) Clean all parts except O-rings with
cleaning solvent (FED SPEC PD 680) and dry
thoroughly.
Section V. BOOM AND FEED PIVOT MECHANISM
5-17. General
b. Disassembly.
a. The chain feed assembly is operated by a
the centralizer assembly, the drill and feed control
heavy duty roller chain powered by a piston air
valve, and feed assembly.
motor which drives a worm gear transmission.
(2) Remove the feed transmission (para 5-6).
b. The boom and feed pivot mechanism is of a
(3) Remove the drifter drill engine (para 5-
heavy steel construction. It is operated by five
10).
double acting, self locking, hydraulic cylinders,
(4) Disassemble the feed and feed chain
one each for feed, lift, boom lift, feed swing and
mechanism in numerical sequence as illustrated in
boom swing. A l l boom and pivot points are
equipped with bronze bushings.
5-18. Feed and Feed Chain Removal and
Disassembly
remove the feed mechanism.